Abstract
Recent years have seen considerable expansion in fish farming using sea cages. These have until recently been located in the sheltered and low current environments of sea lochs and fjords. Significant benthic enrichment is known to occur at these sites, but the effect is highly localized. Fish farm development is now occurring in areas with strong tidal flows. The siting of caged fish farming in macro-tidal environments may reduce the environmental impact of the industry on benthic communities at the farm site. However there exists the potential for accumulation of farm wastes in nearby sedimentary sinks. Additionally the longer residence time of the wastes in the water column has the potential, especially in regions with already high nutrient loadings and/or long flushing times, to lead to stimulation of phytoplankton blooms. Environmental monitoring of such developments therefore needs to consider these addition effects.
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